Drill-chuck.



No. 819,744. .PATENTED MAY 8 S. A. EIERMANN.

DRILL CHUCK APPLICATION FILED JULY 6.1905.

mansw. n. mu cc. PflilO-UTNOGRAPNERE. wAsnmawu. a, c.

U TED STATES PATENT OFFICE.

SOPHUS A. EIERMANN, OF OMAHA, NEBRASKA, ASSIGNOR OF ONE-HALF TO JOSEPH(J. MOORE, OF OMAHA, NEBRASKA.

DRILL-CHUCK.

Specification of Letters Patent.

Patented May 8, 1906.

To aZZ whom it may concern.-

Be it known that I, SoPHUs A. EIERMANN, a citizen of the United States,residing at Omaha, in the county of Douglas and State of Nebraska, haveinvented certain new and useful Improvements in Drill Chucks, of whichthe following is a specification.

This invention aims to provide a chuck of novel structure for holdingdrills and kindred tools desired to be quickly and securely held and tobe instantly released and removed junctive parts,

from the chuck.

The invention consists, essentially, of the peculiar formation of thecasing and the adwhereby the workin elements may be quickly andconveniently assembled and easily removed to admit of repairs being madeor to provide for cleaning, inspecting, of other purpose.

For a full description of the invention and the merits thereof and alsoto acquire a knowledge of the details of construction of the means foreffecting the result reference is to be had to the following descriptionand accompanying drawings.

While the invention may be adapted to different forms and conditions bychanges in the structure and minor details without departing from thespirit or essential features thereof, still the preferred embodiment isshown in the accompanying drawings, in which Figure l is a perspectiveview of a chuck embodying the invention. Fig. 2 is a vertical centralsectional view thereof. Fig. 3 is a top view, the cap-plate beingremoved. Fig. 4 is a plan view of the inner plate. 7 Fig. 5 is a detailperspective view of one of the dogs.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

The body of the chuck is provided with a shank 1, which may be of anyform to admit of fitting the chuck to a rod or other part to which it isto be attached. The body comprises a shell or rim 2 and an end wall 3,the parts 1, 2, and 3 bein preferably of integral formation. An annularroove 4 is formed in the inner wall of the shell or rim 2 adjacent tothe end wall 3, and longitudinal grooves 5 intersect therewith. Thelongitudial grooves 5 are equidistant from one another and have aparallel arrangement. A plate 6 is loosely fitted within the shell orrim 2 and is rotatable therein, being prevented from outwarddisplacement by lugs 7, which enter and operate in the annular groove 4,said lugs bein adapted to pass through the longitudina rooves 5 when theplate 6 is adjusted to bring said lugs in reglstry with said grooves 5.The plate 6 is formed with a central opening around which is arranged aseries of teeth 8.

The dogs or grippin -j aws are double ended and comprise a curved body9,-a hub 11, and trunnions 10. The end portions of the body aresimilarly formed to rovide like rippingjaws, and the hub 11 is centrallydisposed. When the dogs are in position, their hubs snugly fit therespective longitudinal grooves 5, and the trunnions 10 are journaled inopenings formed in the inner plate 6 and a companion outer plate 12. Thetwo plates 6 and 12 are connected together by means of machine-screws 13or like fastenings, which will admit of ready separation of the plateswhen it is required to gain access to the interior of the chuck for anypurpose.

The outer plate 12 corresponds in diameter with the diameter of theshell or rim 2, so as to come about flush therewith at its outerperiphery. The ed e of the outer plate 12 is preferably mille knurled,or otherwise roughened to enable the operator to obtain a firm gripthereon when it is required to return the plate for operating the chuckeither to release or to secure the tool when placed in position. Theplate 12 is formed with a central opening of a size to admit of the endof the drill or like tool being inserted into the chuck so as to beengaged by the jaws of the dogs or gripping elements. Projections 14extend from the inner side of the plate 12 between the dogs andconstitute spacers, at the same time assisting in making the device asolid structure. The outer edges of the projections 14 are preferablyhollow or inwardly grooved to provide a close fit and to prevent scalesfrom collecting so as to interfere with the proper working of thedifferent parts.

When assembling the parts, the inner plate 6 is slipped into the shellor rim 2, its lugs 7 passing throu h the longitudinal grooves 5, afterwhich said plate is turned to throw the lugs 7 out of registry with thegrooves 5, whereby the plate is held in position. The dogs are nextplaced in position with their inner trunnions fitted into openings 15 ofthe late 6 and with their hubs 11 seated in the ongitudinal grooves 5.The outer or capplate 12 is neXt placed in position with the projections14 coming between the dogs and with the outer trunnions of said dogsfitted into openings thereof. The machine screws or fastenings 13 areneXt placed in position and connect the plates 6 and 12, therebycompleting the chuck. Rotation of the plate 12 in one direction or theother causes oscillation of the dogs, whereby one or the other of theirends is thrown into operative position so as to grip the tool insertedin the chuck.

My improved chuck is designed principally to be used on stay-bolts forboiler-work, but is of course applicable for holding other work and alsotools. When the stay-bolt or the shank of the tool is inserted throughthe cen tral aperture or opening in the chuck, the end of the bolt ortool shank is brought tight against the toothed or roughened surface ofthe inner plate 3, and then when the chuck is rotated in the lathe orthe like the friction caused by the end of the bolt or shank bearingagainst the toothed surface of the plate 3 will cause the latter to beretarded in its movement relative to the other parts of the rotatingchuck, and this it will be seen will result in binding the dogs or jaws9 tightly against the bolt or shank and assist in holding the samesecurely in place.

Having thus described the invention, What is claimed as new is 1. In achuck, the combination of a shell 5 having an annular groove andequidistant longitudinal grooves in its inner Walls, an inner platehaving lugs at its periphery to pass through said longitudinal groovesand enter said annular groove, an outer plate connected to the innerplate for synchronous move ment therewith, and dogs arranged between thetwo plates and journaled thereto, and having hubs fitted in thelongitudinal grooves of the shell.

2. In a chuck, the combination of a shell, clutching-pawls mountedtherein, and a rotatable plate in the shell connected with said pawls tolock the same into engagement with the work, the outer face of saidplate being roughened as and for the purpose set forth.

3. In a chuck, the combination of a shell having an annular groove andequidistant longitudinal grooves, an inner plate having lugs at itsperiphery to pass through said longitudinal grooves and enter saidannular groove whereby said plate is mounted to rotate within the shell,dogs or pawls mounted upon said plate and provided with hubs seated insaid longitudinal grooves whereby the rotation of the plate with respectto the shell will actuate said pawls, and an outer plate mounted on theshell to connect with the first-named plate, the outer face of thefirst-named plate being roughened or toothed as and for the purpose setforth.

In testimony whereof I afiiX my signature in presence of two Witnesses.

SOPHUS EIERMANN. [1,. 5.]

Witnesses:

- ROBERT E. ALLEN, SAM H. FARNSWORTH.

